Enobosarm is the most extensively studied SARM in humans, with published phase II data in older adults and cancer-related muscle wasting. Lean mass gains are real but modest, and the safety record in trials does not extend to the doses, durations or unregulated products used recreationally.
Key points
- Phase II data reported increases in lean body mass and stair-climb power at 1–3 mg/day over 12 weeks.
- Effect sizes are far smaller than those associated with supraphysiological anabolic steroid use.
- Suppression of endogenous testosterone and reductions in HDL cholesterol are consistently observed.
- Independent testing of internet-sold 'SARM' products has repeatedly found mislabelling, substitution and undeclared substances.
What the literature shows
Dalton and colleagues reported that 3 mg/day enobosarm increased total lean body mass versus placebo in healthy elderly men and postmenopausal women, with improvements in physical function measures.
Later cachexia programme trials reproduced lean mass changes but did not consistently translate them into functional endpoints, which is why the compound never reached approval.
Case reports describe cholestatic and hepatocellular liver injury following ostarine use in otherwise healthy young men, typically presenting weeks into use.
Analytical work on products marketed as SARMs and sold online found that a minority contained the labelled compound at the labelled dose; several contained unapproved drugs entirely.
What remains unknown
- No long-term (multi-year) human safety data exists at any dose.
- Recovery time for suppressed endogenous testosterone after extended recreational use is poorly characterised.
- Interaction risk with hepatotoxic medications and alcohol has not been formally studied.
Safety and monitoring implications
- Liver injury has been documented at recreational doses; new fatigue, dark urine, itching or jaundice warrants immediate medical review.
- HDL suppression and blood pressure changes are plausible cardiovascular concerns over repeated use.
- Product identity cannot be assumed from a label; without independent analysis the actual exposure is unknown.
Cited literature
- 1.Dalton JT, Barnette KG, Bohl CE, et al. (2011). The selective androgen receptor modulator GTx-024 (enobosarm) improves lean body mass and physical function in healthy elderly men and postmenopausal women. Journal of Cachexia, Sarcopenia and Muscle. Find on PubMed
- 2.Van Wagoner RM, Eichner A, Bhasin S, et al. (2017). Chemical composition and labeling of substances marketed as selective androgen receptor modulators and sold via the internet. JAMA. Find on PubMed
- 3.Flores JE, Chitturi S, Walker S. (2020). Drug-induced liver injury by selective androgenic receptor modulators. Hepatology Communications. Find on PubMed
Community reports
Anecdotal — not scientific evidence
Lived experience is valuable context and often surfaces problems before the literature does. It is also uncontrolled, unverified and subject to bias, so it never overrides published findings here.
Australian training forums, aggregated threads
MixedUsers commonly report noticeable strength progression within 3–4 weeks and mild joint comfort, with recovery of libido and energy taking longer than expected after stopping.
Vendor review sections
MixedReported effects vary sharply between suppliers of the same nominal compound, which is consistent with the mislabelling found in analytical studies.
Buying Ostarine / enobosarm in Australia: what to check first
APEDRA does not sell Ostarine / enobosarm or any other product, and takes no commission from suppliers. If you are researching where to buy it, the biggest practical risk is not the compound itself but what is actually in the bottle: under-dosing, substitution with a different compound, and contamination are all documented in independent testing of online research chemicals.
- Ask for a batch-specific third-party lab report (HPLC/mass spectrometry), not a generic certificate.
- Check independent review platforms, not only reviews hosted on the seller's own site.
- Read the shipping, returns and refund policies before ordering.
- Be wary of prices far below the market or exaggerated results claims.
Compare Australian vendors independently · how we assess suppliers
Terms used here are defined in our glossary, and the evidence-grading scale explains what this analysis's grade means. If you believe something here is wrong, tell us.
This analysis is educational. It is not medical advice, a dosing recommendation, or an endorsement of use. Speak with a qualified medical practitioner about your circumstances.